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New England Intercollegiate Geological Conference: Hartford

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New England Intercollegiate Geological Conference: Hartford DISCLAIMER Before visiting any of the sites described in the New England Intercollegiate Geological Conference guidebooks, you must obtain permission from the current landowners. Landowners only granted permission to visit these sites to the organizers of the original trips for the designated dates of the conference. It is your responsibility to obtain permission for your visit. Be aware that this permission may not be granted. Especially when using older guidebooks in this collection, note that locations may have changed drastically. Likewise, geological interpretations may differ from current understandings. Please respect any trip stops designated as “no hammers”, “no collecting” or the like. Consider possible hazards and use appropriate caution and safety equipment. NEIGC and the hosts of these online guidebooks are not responsible for the use or misuse of the guidebooks. 40th New England Intercollegiate Geological Conference FIEID TRIP A Triassic sedimentary roclcs of central Connecticut; their petrology, petrography, stratigraphy and structure General remarks Stratigraphy,— The mapping subdivisions of the Connecticut Triassic are as follows: Newark group Portland arkose (Upper or Eastern sandstones) Meriden formation Hampden basalt member (Third, Upper, or Posterior lava flow) Upper sedimentary member (Posterior or Middle shales) Holyoke basalt member (Second, Middle, or Main lava flow) Lower sedimentary member (Anterior sandstones and shales) Talcott basalt member (First, Lower, or Anterior lava flow) New Haven arkose (Under or Western sandstones). In addition, there are intrusive masses, mainly sills, of dolerite. The stratigraphy and sedimentary petrography of the Newark group in central and southern Connecticut has recently been described by Krynine (1950). Structure.— In most of the Triassic area the beds strike near north and dip east at angles near 15 degrees. Hence the oldest rocks crop out to the west, the youngest to the east. The western boundary is in part an unconformity, in part a normal fault of no very great throw, probably a few hundred feet. It is described by Wheeler (1937). The eastern boundary is a normal fault of very great throw, not less than 16,000 feet and perhaps much more. The presence of fanglomerate in each of the subdivisions of the Newark group where they approach this fault shows that it was active during Triassic deposition. Between these two boundaries, the Triassic rocks of the Hartford-Meriden area are cut by a number of other normal faults, most or all downthrown to the west and hence repeating the east-dipping beds at the surface. The largest of these faults passes through Meriden between the Hanging Hills and Lamentation Mountain; it has a threw of several thousand feet. West of it, in the Hanging Hills, the Triassic rocks strike nearly east-west and dip north. Other exceptions to the general rule of east dip are found mainly close to the eastern boundary fault in southern Connecticut. Bibliography.— The references cited in this guide are: Digman, Ralph, 1950, An exposure of the Triassic eastern border fault in Connecticut: Am. Jour. Sci., v. 248, p. 37-45. Krynine, P. D., 1950, Petrology, stratigraphy, and origin of the Triassic sedimentary rocks of Connecticut: Connecticut Geol. Nat. History Survey Bull. 73. Wheeler, Girard, 1937, The west wall of the Now England Triassic lowland: Connecticut C-eol. Nat, History Survoy Bull. 58. Itinerary 0.0 Summit Street, Hartford, just wost of Geology Building of Trinity College (Hartford South quadranglo). Froceod south on Summit Street, which follows summit of ridge underlain by 3rd (Hampton) lava flow in Meriden formation. 0.3 Gate of Trinity Campus. TURN RIGHT on New Britain Avenue, U. S. Highway 6. (We follow Highway 6 for 14 miles.) 0.4 Road drops down scarp face of ridge undorlain by 3rd flow. 1.1 Intersection with White St. BEAR RIGHT on New Britain Avenue. 1.3 - 1.4 Outcrop of 2nd (Holyoke) lava flow on left. This outcrop belt of the 2nd flow is cut off here by a diagonal fault (the same fault that cuts off the 3rd flow north of the Trinity Campus). Beyond the fault we are over the Portland formation, above the 3rd flow. 1.9 Enter town of 'Test Hartford. 2.4 Underpass beneath main Connecticut Valley line of New Haven Railroad. 3.5 Ridge underlain by 3rd lava flow. 3.9 Enter New Britain quadrangle. 4.4 Outcrop of 3rd lava flow, repeated by faulting. 4.4 - 4.5 Traffic circle. Take FIRST RIGHT on Colt Highway, following D. S. 6. 4.6 Enter town of Farmington. Outcrop of 3rd lava flow, repeated again by faulting. 4.9 - 5.0 More outcrops of 3rd lava flow. 7.4 - 8.4 Scattered outcrops of top of 2nd lava flow. 8.5 - 8,7 Roatod leftcuts. through Farmington Mountain, upheld by 2nd lava flow. Quarry 9.0 - 9.3 Road cuts through 1st (Talcott) lava flow. 9.7 Road crosses State Highway 10 (College Highway). From this point for 5 miles, the road crosses the outcrop belt of the New Haven arkose, the lowest formation of the Newark group of Connecticut, but it is completely covered with glacial drift. A mile north of the road is the curious elbow of the Farmington River, which after flowing southeast out of the Highlands here turns abruptly north for 13 miles before breaking through the mountain underlain by the 2nd flow. The River may originally have proceeded southeast through Cooks Gap, two miles south of the road. 10.3 Cross Pequabuck River and ascend gla cial river-terrace beyond. Continue on U. S. 6 whioh is now Scott Swamp Road. 11.6 Enter Bristol quadrangle. 12.9 Enter town of Bristol. Road becomes Farmington Avenue. 14.5 We are approaching the front of the Western Highlands, here formed by the Hartland schist. The front of the Highlands is a fault here, as shown beyond (16.3). 14.7 TURN LEFT on King Street. 15.2 BEAR LEFT on level on King Street. 15.3 - 15.4 Outcrops of silicified Triassic conglomerate, showing slickensides on east-dipping fractures. Locality 13 of 'Wheeler (1937). 16,1 Outcrop of silicified Triassic conglomerate on right. A-3 16.3 - 16.4 Go sltsw but do not stop. Drivers be ready for intersection. Poor outcrops of silicified conglomerate on right are followed after short gap by large outcrop of Hartland mica schist. Fault must intervene, as schist makes hill rising 200 feet just to west. More outcrops of schist at road corners and in bed of Bsquabuck River under bridge. Locality 12 of Wheeler (1937), 37 of Krynine (1950 ; see Bristol in index). At junction with State Highway 72, BEAR RIGHT under railroad, then BEAR LEFT across Pequabuck River on Middle Street. Locality 37a of Krynine (1950; see Forestville in index) is on south side of Route 72 1 mile east of intersection; here unusually carbonaceous sandstone, siltstone, and shale are found in the New Haven arkose, which rarely contains unoxidized material. 16.6 At school, BEAR RIGHT on Lake Avenue. The Highland front is conspicuous on the right. 18.5 Enter town of Southington. Lake Avenue becomes Mount Vernon Road and follows a crevasse filling beside Lake Compounce, which fills a kettle. 19.7 Enter Southington quadrangle. 21.0 STOP in front of house by bridge over Roaring Brook. Walk a quarter of a mile up trail on north side of brook to narrow gorge. First outcrops show Triassic conglomerate; larger outcrops show Triassio resting unconformably upon Hartland mica schist and pegmatite. Locality 10 of Wheeler (1937), 39 of Krynine (1950; see Roaring Brook in index). Note however that the unconformity, projected upstream, will not pass over the steep hill to the west, which is schist to the top. Hence the fault present at Bristol (or a parallel fault) must pass between the brook locality and the hill; study of the new maps and airplane photographs shows that it continues south-southwest into the crystalline rocks and does not follow the Triassic border southward from here, as suggested by "'heeler. Krynine's petrographic work has confirmed Barrell's conclusion that the Triassic material is not derived from the underlying schist to any considerable degree, but from the Eastern Highlands 15 miles to the east. Proceed south on Mount Vernon Road. The Hanging Hills, conspicuous to the left, represent the south end of the monoclinal (though faulted) ridge extending south from Farmington Mountain (crossed at 8.6). 21.7 TURN LEFT on West Center Street. Wo now return across the outcrop belt of the Now Haven arkose, which is as badly covered as before. We will see typical New Haven arkose later, at Hanover Pond. 23.3 Intersection with West Street. JOG RIGHT and proceed on Wost Center Street, orossing large drumlinoid hill. Two to three miles to the north along West Street, on the southwest flank of Redstone Hill, is Locality 36 of Krynine (1950), the type locality for his redstone facies of the New Haven arkoso. 24.0 - 24.1 Cross Quinnipiac River and railroad grade crossing. 24.2 TURN LEFT on Liberty Street. 24.35 TURN RIGHT on Center Street. 24.5 TURN LEFT on State Highway 10, the College Highway. A-4 25.4 Enter Meriden C7^') quadrangle. 25.6 TURN RIGHT up hill on Flanders Street. 26.6 Hills ahead are over 1st lava flow. 27.2 TURN LEFT on Flanders Road. 27.5 Reenter New Britain quadrangle. 27.8 TURN RIGHT on Mine Hollow Road. 28.2 - 28.3 Outcrops of redstone at top of New Haven arkose on right. Locality 33 of Krynine (1950; see Shuttle Meadow Pass in index). 28.3 - 28.4 Outcrops of 1st lava flow (Talcott member of Meriden formation) on left.
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